UCS is a reliable, pre-configured Linux server operating system featuring: Active Directory-like domain services compatible with Microsoft Active Directory; a mature and easy-to-use Web-based management system for user, rights, and infrastructure management; a scalable underlying concept suited for single server scenarios as well as to run and manage thousands of clients and servers for thousands of users within one single UCS domain; an app center providing single-click installation and integration of many business applications from 3rd parties and Univention; management capabilities to manage Linux- and UNIX-based clients; and command line, scripting interfaces, and APIs for automatization and extension. Its purpose is to provide Microsoft Server-like services on the cloud or on the premises, to run and operate corporate IT environments with Windows- and Linux-based clients, and to extend those environments with proven enterprise software.

Univention Corporate Client (UCC) is a flexible and efficiently manageable operating system for PCs, notebooks, and thin clients in companies and institutions. The software contains a Linux-based desktop environment optimized for business use. It allows desktops to be adapted to hardware and intended applications. In addition, it can be managed conveniently and efficiently via a Web-based console. In comparison to other systems, it guarantees integrated administration procedures for users, clients, desktops, and permissions and effectively does away with the use of different, uncoordinated tools. It serves as a platform for access to remote desktop solutions and virtualized desktops as well as browser or terminal server-based applications.

DragonFly belongs to the same class of operating systems as other BSD-derived systems and Linux. It is based on the same Unix ideals and APIs and shares ancestor code with other BSD operating systems. DragonFly is differentiated from other operating systems in its class by, among others, the HAMMER file system, Virtual Kernels, swapcache, and the pervasive use of soft token locks. DragonFly provides an opportunity for the BSD base to grow in an entirely different direction from the ones taken in the FreeBSD, NetBSD, and OpenBSD series.

Cross Linux From Scratch (CLFS) is a project that
provides you with step-by-step instructions for
building your own customized Linux system entirely
from source. This is a multi-architecture version
of Linux From Scratch that is cross-compiled. It
currently supports Alpha, MIPS, PowerPC, Sparc,
x86, and x86_64.

Alpine Linux is a community developed operating system designed for x86 routers, firewalls, VPNs, VoIP boxes, and servers. It has proactive security features like PaX and SSP, which prevent security holes in the software from being exploited. It is based on uClibc and Busybox.

openmamba is a fully featured GNU/Linux distribution for desktops, notebooks, netbooks, and servers. It runs on computers based on the 32-bit Intel x86 architecture, or on 64-bit AMD processors in 32-bit mode. openmamba comes with both free and closed source drivers for the most frequently used video cards. It supports compiz out of the box. It has preinstalled multimedia codecs, and can install the most frequently used closed source applications for GNU/Linux (such as Flash Player or Skype) very easily.

Comal-Linux is a Linux distribution derived from Slackware Linux. It is packaged as a live CD, and is intended for desktop users who want to use Slackware Linux without first installing it on their computers. Comal-Linux is built from "pure" Slackware Linux, making it as compatible with the original as possible, including application packages. By choosing lightweight desktop and application software, the distribution can be used on older computers. Comal-Linux is an unofficial Muslim edition of Slackware.

Nexus is a new operating system for trustworthy computing. It can take advantage of Trusted Platform Modules (TPMs) to issue trustworthy certificates of program properties. It provides user-level device drivers, isolated protection domains, interprocess communication, and partial POSIX support. It runs on x86 hardware.